The vernier shown has zero error. It has $10$ vernier divisions equal to $9$ main scale divisions, and one main scale division is $1 mm$ . A rod's observed reading is $5.4 mm$ . If the instrument were free of zero error, what would the main scale reading be in mm?

Question

Reconstructed diagram: source figure lacked vernier ticks. Scale positions inferred from printed zero error and 10 VSD = 9 MSD.

TestHub · Accepted Answer

True length = 5.4 − ( − 0.7 ) = 6.1 mm . For an error-free instrument, main scale reading = 6 mm .

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